InterlockedDecrementAcquire function
Decrements (decreases by one) the value of the specified 32-bit variable as an atomic operation. The operation is performed with acquire memory ordering semantics.
Syntax
LONG __cdecl InterlockedDecrementAcquire(
_Inout_ LONG volatile *Addend
);
Parameters
- Addend [in, out]
-
A pointer to the variable to be decremented.
Return value
The function returns the resulting decremented value.
Remarks
The variable pointed to by the Addend parameter must be aligned on a 32-bit boundary; otherwise, this function will behave unpredictably on multiprocessor x86 systems and any non-x86 systems. See _aligned_malloc.
The interlocked functions provide a simple mechanism for synchronizing access to a variable that is shared by multiple threads. This function is atomic with respect to calls to other interlocked functions.
This function is implemented using a compiler intrinsic where possible. For more information, see the WinBase.h header file and _InterlockedDecrement_acq.
This function is supported only on Itanium-based systems.
For processors that do not support acquire memory ordering semantics, this function is defined as a call to the InterlockedDecrement function. For more information, see WinBase.h.
Requirements
|
Minimum supported client |
Windows Vista [desktop apps | Windows Store apps] |
|---|---|
|
Minimum supported server |
Windows Server 2003 [desktop apps | Windows Store apps] |
|
Header |
|
See also
- Interlocked Variable Access
- InterlockedDecrement
- InterlockedDecrementRelease
- InterlockedDecrementNoFence
- InterlockedDecrement16
- InterlockedDecrement16Acquire
- InterlockedDecrement16Release
- InterlockedDecrement16NoFence
- InterlockedDecrement64
- InterlockedDecrementAcquire64
- InterlockedDecrementRelease64
- InterlockedDecrementNoFence64
- Synchronization Functions